n C3 plants the conservation of water promotes<\/p>\n\n\n\n
a. photorespiration<\/p>\n\n\n\n
b. photosynthesis<\/p>\n\n\n\n
c. a shift to C4 photosynthesis<\/p>\n\n\n\n
d. the light reactions<\/p>\n\n\n\n
e. the opening of stomata<\/p>\n\n\n\n
The correct answer and explanation is:<\/mark><\/strong><\/p>\n\n\n\n The correct answer is:<\/p>\n\n\n\n a. photorespiration<\/strong><\/p>\n\n\n\n In C3 plants, water conservation often comes at the expense of efficient photosynthesis due to the physiological response of closing stomata under water-limited conditions. Here’s why:<\/p>\n\n\n\n Stomata are small pores on the leaves that facilitate gas exchange. When stomata are open, CO\u2082 enters the leaf for photosynthesis, and water vapor exits due to transpiration. Under drought or water-limited conditions, stomata close to reduce water loss.<\/p>\n\n\n\n When stomata close, the internal concentration of CO\u2082 in the leaf decreases because CO\u2082 cannot enter. As a result, the ratio of CO\u2082 to O\u2082 in the leaf becomes imbalanced, favoring oxygenation over carboxylation.<\/p>\n\n\n\n The enzyme RuBisCO<\/strong>, which catalyzes the first step of the Calvin cycle, can use either CO\u2082 or O\u2082 as a substrate. When CO\u2082 levels are low (due to closed stomata), RuBisCO increasingly binds to O\u2082 instead of CO\u2082. This process is called photorespiration<\/strong>. Unlike photosynthesis, photorespiration:<\/p>\n\n\n\n C3 plants, which use the Calvin cycle for carbon fixation, are particularly vulnerable to photorespiration under conditions of low CO\u2082 availability. This process is a major inefficiency in C3 photosynthesis, especially under hot, arid conditions.<\/p>\n\n\n\n While photorespiration is often seen as a wasteful process, it may help protect the plant from oxidative stress during drought. However, it reduces overall photosynthetic efficiency and crop productivity, which is a challenge for agriculture in water-scarce regions.<\/p>\n\n\n\n Thus, in C3 plants, conserving water by closing stomata indirectly promotes photorespiration due to reduced CO\u2082 availability inside the leaf.<\/p>\n","protected":false},"excerpt":{"rendered":" n C3 plants the conservation of water promotes a. photorespiration b. photosynthesis c. a shift to C4 photosynthesis d. the light reactions e. the opening of stomata The correct answer and explanation is: The correct answer is: a. photorespiration Explanation: In C3 plants, water conservation often comes at the expense of efficient photosynthesis due to […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-184271","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/184271","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=184271"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/184271\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=184271"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=184271"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=184271"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Explanation:<\/h3>\n\n\n\n
1. Stomata and Water Loss<\/strong>:<\/h4>\n\n\n\n
2. CO\u2082 Limitation<\/strong>:<\/h4>\n\n\n\n
3. Photorespiration<\/strong>:<\/h4>\n\n\n\n
\n
4. Impact on C3 Plants<\/strong>:<\/h4>\n\n\n\n
5. Significance<\/strong>:<\/h4>\n\n\n\n